There were apparently a number of migrations to the North American continent, and not all of them necessarily from the Asian land bridge. Some of the very early waves may have been from across the Pacific Ocean, landing in Central and South America, and eventually spreading to the Tierra de Fuego in the southern tip of Chile, and the Amazon rain forest. There may also have been a migration starting in Europe, crossing by small craft skirting the edge of the polar ice cap, in an arc from perhaps present-day Scotland, the south tip of Greenland, and ending in the Maritime provinces of Canada, and thence southward and westward. Also many millennia before Lief Ericsson.
What are euphemistically called “New World Indians” are really a very diverse people, genetically and by place of origin.
Well said.
Columbus was supposed to have gone to Ireland to obtain maps of the lands across the ocean.